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I use for my component a categories table like the categories table from Joomla. So the structure has also the columns from the Joomla categories table: - Table jos_my_categories structure: id, parent_id, lft, rgt, level, title ...

Normally is use for the default sort order: $query->order('c.lft'); which gives a result as example (only categories titles):

  • beta
    • charly
    • alpha
    • beta
  • alpha
    • beta
      • zulu
      • sierra
    • charly
    • alpha
  • charly
    • alpha
    • beta
    • charly

But required is alternate also a tree result in alpbabetical order (also for the sub categories - in all levels):

  • alpha
    • alpha
    • beta
      • sierra
      • zulu
    • charly
  • beta
    • alpha
    • beta
    • charly
  • charly
    • alpha
    • beta
    • charly

How must in this case be the query?

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2

I m just trying to answer. You can try 

$query->order('c.lft,c.name ASC');

If you can provide the Complete Query or code then you might get the exact answer.

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3
  • Thanks for the hint. But this has not helped. The 'lft' column can only have 'unique' values. – mikael Nov 4 '14 at 15:02
  • Okay i have find out that it is not possible to sort alphabetical nested sets. So i must use a own sort method. So we can close my question. – mikael Nov 5 '14 at 10:27
  • When anybody else search the solution, here can you find it: stackoverflow.com/a/20448404/3319544 – mikael Nov 5 '14 at 17:30

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